Comparative Study of the Surface Properties and the Reactivity of Coal Pyrite and Mineral Pyrite.
Lai RW; Diehl JR; Hammack RW; Khan SUM
Soc Min Eng AIME Preprint 89-6 1989 :13 pages
Cyclic voltammetry (cv), flotation response, evolved-gas analysis (ega), and x-ray photoelectron spectroscopy (xps) were employed to evaluate the major differences in the surface properties and surface reactivity of coal pyrite and mineral pyrite. Surface properties of pyrite were evaluated in terms of flotation response in the presence of both an anionic fluorosurfactant and sodium hydrosulfide. The charge transfer adsorption and oxidation potential of sodium hydrosulfide were evaluated using cyclic voltammetry. Current- voltage dependence indicated that the coal pyrite behaved as an n- type semiconductor and that the mineral pyrite acted as a p-type semiconductor. Drastic differences in the flotation response have been observed between the coal pyrite and the mineral pyrite. Significant differences in the cyclic voltammograms at pyrite surfaces of these two sources were also observed. Measurements by xps and ega were used to determine the oxidation products and the rate of oxidation of the coal-pyrite and the mineral-pyrite surfaces.
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